More tests, misc fixes

tests/Http/Middleware/NotFoundHandlerTest.php

@@ -0,0 +1,29 @@
+<?php
+
+namespace NoccyLabs\Mercureact\Http\Middleware;
+
+use PHPUnit\Framework\Attributes\CoversClass;
+use Psr\Http\Message\ResponseInterface;
+use React\Http\Message\ServerRequest;
+use React\Promise\Promise;
+
+#[CoversClass(NotFoundHandler::class)]
+class NotFoundHandlerTest extends \PHPUnit\Framework\TestCase
+{
+
+    public function testAlwaysResolvesTo404Response()
+    {
+
+        $handler = new NotFoundHandler();
+        $request = new ServerRequest("GET", "/");
+        $result = null;
+        $promise = $handler->__invoke($request)->then(function ($r) use (&$result) {
+            $result = $r;
+        });
+
+        $this->assertInstanceOf(ResponseInterface::class, $result);
+        /** @var ResponseInterface $result */
+        $this->assertEquals(404, $result->getStatusCode());
+    }
+
+}